Allow symlinks to device or vendor tree in envsetup.sh.
Allow symlinks to device or vendor tree in envsetup.sh.

Change-Id: I1190a0b1c84fa17b3692427eb6071ffbe84bc529

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build